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Q&A #1530

Teachers' Lounge Discussion: Factoring out -1 in algebraic expressions

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From: Anonymous 
To: Teacher2Teacher Public Discussion
Date: 2003030123:23:15
Subject: x squared minus one divided by one minus x

	
How do I do this?
so far I've got (x+1)(x-1)/-(x-1)
cancel out the x-1
leaving me with x+2/-1
the answer is -(x+1) but why why why???

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